Concussion. A concussion is. What is a concussion? There are many. What causes a concussion? Every time you. How Dangerous Are Concussion. Over time, repeated concussions can change chemicals and cells in the brain. You don't have to pass out (lose consciousness) to have a concussion. What are the symptoms. Symptoms of a concussion range from mild to severe and can last for hours. How long takes a concussion. Your doctor will. How Concussion Is Treated.

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  • 2016 m.
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Concussion. (2016 m. Vasario 24 d.). Peržiūrėta 2018 m. Balandžio 24 d. 19:16